30 Aquarii, a yellow giant star in Aquarius
30 Aquarii is a yellow giant star in the constellation Aquarius. At 303 light years away, it shines at an apparent visual magnitude of 5.55.
30 Aquarii (HIP 108868)
30 Aquarii is a yellow giant star in the constellation Aquarius. At 303 light years away, it shines at an apparent visual magnitude of 5.55. The iron abundance of 30 Aquarii is -0.02 (95.5% of the Sun). It is moving through the Galaxy at a speed of 36.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,000 and 47,100 light years from the center of the Galaxy. It came closest to the Sun 2.1 million years ago when it had brightened to magnitude 4.34 from a distance of 174 light years.
Sky position: RA 22h 3.3m, Dec -6° 31.2'
Common designations: 30 Aquarii, HIP 108868, HD 209396, HR 8401
Galactic Orbit of
30 Aquarii
(compared to the
Sun)
E
ccentricity: 32.6% vs. 16.0%Angle φ : 6.6°vs. 26.0°
Semi-major axis : 10,902 pc vs. 8,686 pc
Semi-minor axis: 10,307 pc vs. 8,574 pc
Focus-to-center
: 3,554 pcvs. 1,388 pcSemilatus rectum : 9,744 pc vs. 8,464 pc
Perigalacticon: 7,348 pc vs. 7,297 pc
Apogalacticon
: 14,456 pcvs. 10,074 pcSome Tabulated XHIP Data for 30 Aquarii
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 330.81846376° ±0.30 mas | 46.52 ±0.31 mas/yr. |
| Declination: | -6.52242696° ±0.24 mas | 8.05 ±0.23 mas/yr. |
| Galactic Longitude: | 52.41286103° | 31.71 mas/yr. |
| Galactic Latitude: | -45.11150913° | -34.97 mas/yr. |
Parallax: 10.74 ± 0.34 mas
Spectrography
Spectral Type: G8III 2000ApJS..130..201H.
Radial Velocity: 29.70 ±2.90 km/s [A rating] 2006AstL...32..759G.
Iron Abundance [Fe/H]:
-0.02 ±0.06 dex
1990ApJS...74.1075M.
Photometry
| band | magnitude | Abs. Mag. |
| U | ||
| B | 6.51 | 1.67 |
| V | 5.55 | 0.71 |
| R | ||
| I | 4.71 | -0.13 |
| J | 4.17 | -0.68 |
| H | 3.62 | -1.23 |
| K | 3.52 | -1.32 |
B-V: +0.96 V-I: +0.84
Derivations
Heliocentric distance: 93.00 pc (3.2% margin of error)
Galactocentric distance: 7,360 pc
Transverse velocity: 20.8 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 40.0 pc | 52.0 pc | -65.9 pc |
| Velocity (U, V, W) | -5.0 km/s | 16.5 km/s | -31.9 km/s |